lib/memory.h

   1 /*
   2  * Copyright (c) 2015-16  David Lamparter, for NetDEF, Inc.
   3  *
   4  * Permission to use, copy, modify, and distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #ifndef _QUAGGA_MEMORY_H
  18 #define _QUAGGA_MEMORY_H
  19
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <frratomic.h>
  23 #include "compiler.h"
  24
  25 #define array_size(ar) (sizeof(ar) / sizeof(ar[0]))
  26
  27 #if defined(HAVE_MALLOC_SIZE) && !defined(HAVE_MALLOC_USABLE_SIZE)
  28 #define malloc_usable_size(x) malloc_size(x)
  29 #define HAVE_MALLOC_USABLE_SIZE
  30 #endif
  31
  32 #define SIZE_VAR ~0UL
  33 struct memtype {
  34         struct memtype *next, **ref;
  35         const char *name;
  36         _Atomic size_t n_alloc;
  37         _Atomic size_t n_max;
  38         _Atomic size_t size;
  39 #ifdef HAVE_MALLOC_USABLE_SIZE
  40         _Atomic size_t total;
  41         _Atomic size_t max_size;
  42 #endif
  43 };
  44
  45 struct memgroup {
  46         struct memgroup *next, **ref;
  47         struct memtype *types, **insert;
  48         const char *name;
  49 };
  50
  51 /* macro usage:
  52  *
  53  *  mydaemon.h
  54  *    DECLARE_MGROUP(MYDAEMON)
  55  *    DECLARE_MTYPE(MYDAEMON_COMMON)
  56  *
  57  *  mydaemon.c
  58  *    DEFINE_MGROUP(MYDAEMON, "my daemon memory")
  59  *    DEFINE_MTYPE(MYDAEMON, MYDAEMON_COMMON,
  60  *                   "this mtype is used in multiple files in mydaemon")
  61  *    foo = qmalloc(MTYPE_MYDAEMON_COMMON, sizeof(*foo))
  62  *
  63  *  mydaemon_io.c
  64  *    bar = qmalloc(MTYPE_MYDAEMON_COMMON, sizeof(*bar))
  65  *
  66  *    DEFINE_MTYPE_STATIC(MYDAEMON, MYDAEMON_IO,
  67  *                          "this mtype is used only in this file")
  68  *    baz = qmalloc(MTYPE_MYDAEMON_IO, sizeof(*baz))
  69  *
  70  *  Note:  Naming conventions (MGROUP_ and MTYPE_ prefixes are enforced
  71  *         by not having these as part of the macro arguments)
  72  *  Note:  MTYPE_* are symbols to the compiler (of type struct memtype *),
  73  *         but MGROUP_* aren't.
  74  */
  75
  76 #define DECLARE_MGROUP(name) extern struct memgroup _mg_##name;
  77 #define DEFINE_MGROUP(mname, desc)                                             \
  78         struct memgroup _mg_##mname                                            \
  79                 __attribute__((section(".data.mgroups"))) = {                  \
  80                         .name = desc,                                          \
  81                         .types = NULL,                                         \
  82                         .next = NULL,                                          \
  83                         .insert = NULL,                                        \
  84                         .ref = NULL,                                           \
  85         };                                                                     \
  86         static void _mginit_##mname(void) __attribute__((_CONSTRUCTOR(1000))); \
  87         static void _mginit_##mname(void)                                      \
  88         {                                                                      \
  89                 extern struct memgroup **mg_insert;                            \
  90                 _mg_##mname.ref = mg_insert;                                   \
  91                 *mg_insert = &_mg_##mname;                                     \
  92                 mg_insert = &_mg_##mname.next;                                 \
  93         }                                                                      \
  94         static void _mgfini_##mname(void) __attribute__((_DESTRUCTOR(1000)));  \
  95         static void _mgfini_##mname(void)                                      \
  96         {                                                                      \
  97                 if (_mg_##mname.next)                                          \
  98                         _mg_##mname.next->ref = _mg_##mname.ref;               \
  99                 *_mg_##mname.ref = _mg_##mname.next;                           \
 100         }
 101
 102
 103 #define DECLARE_MTYPE(name)                                                    \
 104         extern struct memtype _mt_##name;                                      \
 105         static struct memtype *const MTYPE_##name = &_mt_##name;
 106
 107 #define DEFINE_MTYPE_ATTR(group, mname, attr, desc)                            \
 108         attr struct memtype _mt_##mname                                        \
 109                 __attribute__((section(".data.mtypes"))) = {                   \
 110                         .name = desc,                                          \
 111                         .next = NULL,                                          \
 112                         .n_alloc = 0,                                          \
 113                         .size = 0,                                             \
 114                         .ref = NULL,                                           \
 115         };                                                                     \
 116         static void _mtinit_##mname(void) __attribute__((_CONSTRUCTOR(1001))); \
 117         static void _mtinit_##mname(void)                                      \
 118         {                                                                      \
 119                 if (_mg_##group.insert == NULL)                                \
 120                         _mg_##group.insert = &_mg_##group.types;               \
 121                 _mt_##mname.ref = _mg_##group.insert;                          \
 122                 *_mg_##group.insert = &_mt_##mname;                            \
 123                 _mg_##group.insert = &_mt_##mname.next;                        \
 124         }                                                                      \
 125         static void _mtfini_##mname(void) __attribute__((_DESTRUCTOR(1001)));  \
 126         static void _mtfini_##mname(void)                                      \
 127         {                                                                      \
 128                 if (_mt_##mname.next)                                          \
 129                         _mt_##mname.next->ref = _mt_##mname.ref;               \
 130                 *_mt_##mname.ref = _mt_##mname.next;                           \
 131         }
 132
 133 #define DEFINE_MTYPE(group, name, desc) DEFINE_MTYPE_ATTR(group, name, , desc)
 134 #define DEFINE_MTYPE_STATIC(group, name, desc)                                 \
 135         DEFINE_MTYPE_ATTR(group, name, static, desc)                           \
 136         static struct memtype *const MTYPE_##name = &_mt_##name;
 137
 138 DECLARE_MGROUP(LIB)
 139 DECLARE_MTYPE(TMP)
 140 DECLARE_MTYPE(PREFIX_FLOWSPEC)
 141
 142
 143 extern void *qmalloc(struct memtype *mt, size_t size)
 144         __attribute__((malloc, _ALLOC_SIZE(2), nonnull(1) _RET_NONNULL));
 145 extern void *qcalloc(struct memtype *mt, size_t size)
 146         __attribute__((malloc, _ALLOC_SIZE(2), nonnull(1) _RET_NONNULL));
 147 extern void *qrealloc(struct memtype *mt, void *ptr, size_t size)
 148         __attribute__((_ALLOC_SIZE(3), nonnull(1) _RET_NONNULL));
 149 extern void *qstrdup(struct memtype *mt, const char *str)
 150         __attribute__((malloc, nonnull(1) _RET_NONNULL));
 151 extern void qfree(struct memtype *mt, void *ptr) __attribute__((nonnull(1)));
 152
 153 #define XMALLOC(mtype, size)            qmalloc(mtype, size)
 154 #define XCALLOC(mtype, size)            qcalloc(mtype, size)
 155 #define XREALLOC(mtype, ptr, size)      qrealloc(mtype, ptr, size)
 156 #define XSTRDUP(mtype, str)             qstrdup(mtype, str)
 157 #define XFREE(mtype, ptr)                                                      \
 158         do {                                                                   \
 159                 qfree(mtype, ptr);                                             \
 160                 ptr = NULL;                                                    \
 161         } while (0)
 162
 163 static inline size_t mtype_stats_alloc(struct memtype *mt)
 164 {
 165         return mt->n_alloc;
 166 }
 167
 168 /* NB: calls are ordered by memgroup; and there is a call with mt == NULL for
 169  * each memgroup (so that a header can be printed, and empty memgroups show)
 170  *
 171  * return value: 0: continue, !0: abort walk.  qmem_walk will return the
 172  * last value from qmem_walk_fn. */
 173 typedef int qmem_walk_fn(void *arg, struct memgroup *mg, struct memtype *mt);
 174 extern int qmem_walk(qmem_walk_fn *func, void *arg);
 175 extern int log_memstats(FILE *fp, const char *);
 176 #define log_memstats_stderr(prefix) log_memstats(stderr, prefix)
 177
 178 extern void memory_oom(size_t size, const char *name);
 179
 180 #endif /* _QUAGGA_MEMORY_H */